Scratch

Just don't pay attention to them, or add a comment or tag saying "copied"

Well that's what the "Share!" button is for. You SHARE your work in the community.
If you don't want anybody to copy it then just don't upload it.

As for me, I would be honoured if somebody copies me, because when a person copies a project, that means the person thinks the project is great. So copying a project is basicly adding it to your favorites list.

it does get kind of annoying, but MyRedNeptune has a point. It must have been really good for that person to want to copy it!

JSO wrote:

Just don't pay attention to them, or add a comment or tag saying "copied"

you could also report it. if enough people report a project, it will be taken off the site.

funkymonkey wrote:

you could also report it. if enough people report a project, it will be taken off the site.

I do not encourage flagging copied projects. Who knows who the person who copied is? Maybe it's just a little child who doesn't understand anything yet?

For example, I nearly uploaded a project taken off Scratch when I was experimenting what the "Share!" button does.

Jman720 wrote:

I know he/she has a point, but that is what upsets me, people copying really good projects.

She. 

I like to think that good ideas are free, and that people are willing to help each other out by sharing. 

Sometimes people copy projects when they planning on remixing them or when playing around with Scratch.  No matter what, its always honorable to personally mention who worked on the project before you and show respect for what they did. 

Jman, I like your idea. 

Jman720 wrote:

there could be a system on the site denying any projects that are the exact same. What do you think?

I help the Scratch team, and know they considered this.  But they were concerned that it would be too easy to get around by making even the smallest changes.
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Heres a quesion I have...when is it okay to copy what other people do, and when isn't it?

Bluekingice, plagiarism has nothing to do with profit (you're thinking of copyright violation, patent infringement, or some other form of intellectual property theft).  Plagiarism is an academic sin, and it refers to copying without attribution.  As long as you give proper credit to the original author, it isn't plagiarism (though copying may still violate copyrights or other intellectual property rights).

What MyRedNeptune was saying is that pressing the "Share!" button gives people the right to re-use and modify your code.  If you don't want that to happen, don't share your programs on the MIT web site.

[non Scratch related link removed by Jens]